/*
 * Copyright (C) 2009 Niek Linnenbank
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <FreeNOS/System.h>
#include <FileSystemMessage.h>
#include "Runtime.h"
#include <errno.h>
#include "unistd.h"

ssize_t read(int fildes, void *buf, size_t nbyte)
{
    FileSystemMessage msg;
    FileDescriptor *fd = (FileDescriptor *) getFiles()->get(fildes);

    // Read the file.
    if (fd)
    {
        msg.type   = ChannelMessage::Request;
        msg.action = ReadFile;
        msg.path   = fd->path;
        msg.buffer = (char *) buf;
        msg.size   = nbyte;
        msg.offset = fd->position;
        msg.from   = SELF;
        msg.deviceID.minor = fd->identifier;
        ChannelClient::instance->syncSendReceive(&msg, fd->mount);

        // Did we read something?
        if (msg.result >= 0)
        {
            fd->position += msg.result;
            return msg.result;
        }
        // Set error code
        errno = msg.result;
    }
    else
        errno = ENOENT;

    return -1;
}
